(57) In a system for controlling conditional access systems (143, 145, 147, 149) for television
data in a digital television decoder having a signal processing block with a decoder
descrambler and a conditional access block with at least one conditional access system,
the conditional access block (141) is provided with conditional access system clients
(142, 144, 146, 148), which handle communication with the conditional access systems
(143, 145, 147, 149) via a client interface (152) uniform for all clients (142, 144,
146, 148). Furthermore, the conditional access block (141) is provided with a conditional
access clients manager (151), which handles communication with conditional access
systems (143, 145, 147, 149) via the clients (142, 144, 146, 148) via a client interface
(152) and controls descrambling of signal in the decoder by selecting the conditional
access system (143, 145, 147, 149) responsible for descrambling the currently received
signal and controlling the decoder descrambler (132) depending on the selected conditional
access system (143, 145, 147, 149).
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